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Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment [Table Text Block] |
Property, plant and equipment consisted of the following regulated and non-regulated assets:
As at |  | December 31 | December 31
millions of Canadian dollars | Estimated useful life |  | 2018 |  | 2017
Generation (1) | 3 to 131 | $ | 11,092 | $ | 11,010
Transmission | 11 to 80 |  | 3,047 |  | 2,786
Distribution | 4 to 80 |  | 6,348 |  | 5,660
Gas transmission and distribution | 7 to 85 |  | 3,398 |  | 2,867
General plant and other | 2 to 60 |  | 2,158 |  | 1,874
Total cost |  |  | 26,043 |  | 24,197
Less: Accumulated depreciation (1) |  |  | (8,567) |  | (7,824)
|  |  | 17,476 |  | 16,373
Construction work in progress |  |  | 1,236 |  | 622
Net book value |  | $ | 18,712 | $ | 16,995
(1) On November 26, 2018, the Company announced an agreement to sell the NEGG facilities and as of December 31, 2018, the Company has classified these assets as held for sale. As of December 31, 2017, these assets were recorded within Property, Plant and Equipment on the Consolidated Balance Sheets. Refer to note 17 for additional information.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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